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引用本文:史基安,郭雪莲,王琪,严宁珍,王疆霞.青海湖QH1孔晚全新世沉积物稀土元素地球化学与气候环境关系探讨.湖泊科学,2003,15(1):28-34. DOI:10.18307/2003.0104
SHI Ji'an,GUO Xuelian,WANG Qi,YAN Ningzhen,WANG Jiangxia.Geochemistry of REE in QH1 Sediments of Qinghai Lake since Late Holocene and Its Paleoclimatic Significance. J. Lake Sci.2003,15(1):28-34. DOI:10.18307/2003.0104
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青海湖QH1孔晚全新世沉积物稀土元素地球化学与气候环境关系探讨
史基安1, 郭雪莲1, 王琪1, 严宁珍2, 王疆霞3
1.中国科学院兰州地质研究所气体地球化学国家重点实验室, 兰州 730000;2.西南农业大学资源与环境学院, 重庆 400716;3.长安大学水环境科学系, 西安 710054
摘要:
通过对青海湖QH1孔沉积物稀土元素丰度、分布模式及稀土总量(ΣREE)的分析,结合沉积物中TOG含量、粒度参数的变化特征,探讨了稀土元素纵向变化与气候环境之间的关系.结果表明:青海湖沉积物中稀土元素总丰度值不高,平均值为63mg/kg(不包括Y)左右.总体上表现以半干旱的环境为主导,化学风化作用相对微弱.同时,湖泊沉积物具有轻稀土相对富集、缓右倾斜型、Ge、Eu基本上无明显异常的REE分布模式.稀土元素与总有机碳(TOG),粒度之间存在较好的相关性.分析表明,沉积物中ΣREE高值段指示暖湿气候环境,EREE低值段代表冷干气候环境.根据稀土元素分布与沉积环境的关系,重建了8500aBP以来青海湖区经历4次较大的暖湿-温干-暖偏湿-冷偏干的气候演化过程.从而得出在高寒半干旱地区的青海湖沉积物中稀土元素对古气候变化具有良好的指示作用.
关键词:  稀土元素  分布模式  古气候  青海湖
DOI:10.18307/2003.0104
分类号:
基金项目:气体地球化学国家重点实验室主任基金ZRJJ01资助项目.
Geochemistry of REE in QH1 Sediments of Qinghai Lake since Late Holocene and Its Paleoclimatic Significance
SHI Ji'an1, GUO Xuelian1, WANG Qi1, YAN Ningzhen2, WANG Jiangxia3
1.State Key Laboratory of Gas Geochemistry, Lanzhou Institute of Geology, CAS, Lanzhou 730000, P. R. China;2.Department of Resources and Environment, Southwest Agriculture University, Chongqing 400716, P. R. China;3.Department of Water and Environment, Chang'an University, Xi'an 710054, P. R. China
Abstract:
Rare earth element(REE) concentration and distribution patterns and vertical distribution of total REE(ΣREE) in sediments from Qinghai Lake are presented in this paper. In combination with total organic carbon (TOC) and Grain Size parameters, the relationship between ΣREE and the climate and environment has been discussed. The result shows that the ΣREE values of the sediments from Qinghai Lake vary over a range of 16.262-89.221mg/kg, with an average of 63.001mg/kg. Indicating that the semi-arid environment was dominant with much weaker chemical weathering. The sediments from Qinghai Lake have very similar ΣREE distribution patterns, which are moderately rich in light rare earth element (LREE), with negative slopes and unclear Ce and Eu anomaly. ΣREE contents have good relationships with TOC and Grain Size. During warmer and wetter climatic episodes, the values of ΣREE in sediments are higher; on the contrary, during colder and drier climatic episodes, the values of ΣREE are lower. The further study has reconstructed the paleoclimate evolution of Qinghai Lake since 8.5kaBP, which includes four main climatic and environmental changes that were warm-moist, cool-dry, warm-moist and cold-dry during late Holocene. Finally, we have concluded that ΣREE in sediments of Qinghai Lake is an effective indicator to reconstruct the paleoclimatic variation in the high-cold semi-arid areas because of its sensitivity to the climatic changes.
Key words:  Rare earth element(REE)  paleoclimate  Qinghai Lake
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